Accession Number : AD1036457

Title :   Microtensile Bond Strength Compared Between CAD/CAM Feldspathic and Resin Nano Ceramics

Descriptive Note : Technical Report

Corporate Author : Uniformed Services University of the Health Sciences FORT BRAGG United States

Personal Author(s) : Caldon,Seth D

Full Text :

Report Date : 27 Jul 2015

Pagination or Media Count : 67

Abstract : Objectives: To investigate the microtensile bond strength (TBS) and failure mode of resin cement bonded to feldspathic and resin nano ceramic CAD/CAM crowns. Methods: Feldspathic and nano resin ceramic blocks, which are designed for the CEREC CAD/CAM system (Sirona, Charlotte, NC), are to be used for the study. Four CEREC Vitablocs Mark II (fine-particle feldspar ceramic blocks) I14, size 12x14x18 mm3, (Vita, Bad Sackingen, Germany), and four 3M Lava Ultimate (resin nano ceramic) size14L (3M ESPE Saint Paul, MN) were used. Block surfaces were treated with hydrofluoric acid or air abrasion before application of a layer of Nexus 3 resin cement. Z100 composite was then incrementally cured to the cement in 2 mm increments to a thickness of 5 mm. Blocks were cut creating 50-60, 1 mm2 slabs. The slabs were stored in distilled water at 37C for 24 hours. 12 slabs were chosen at random from each block. Tensile stress was applied to slabs with an Instron Universal machine until failure. 30X light microscope was used to confirm adhesive failure, and the force was recorded in Mpa. The measured MPa were then compared statistically with a Two-Factor ANOVA and Tukey test. Results: Microtensile strength was not statistically different within the blocks A-D for both groups. There was a significantly different between Vitablocs Mark II and Lava Ultimate with 18.5Mpa (+/-3.7) and 47.6MPa (12.2+/-) respectively. Conclusion: Within the limitations of this study, Lava Ultimate has a significantly higher bond strength compared to Vitablocs Mark II.

Descriptors :   computeraided design , tensile stress , flexural strength , ceramic materials , silicon compounds , adhesive bonding , teeth , DENTISTRY

Subject Categories : Adhesives, Seals and Binders
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE